Echo crossfire has been my favorite for all purpose. Can't hardly find it anymore around here. The Stihl x line has it uses too. I keep it on hand.
I am really liking the husqvarna line at this time.
Jake wells, with that gator line, turn the trimmer over and go full throttle and watch the line. It would wave and wonder and not hold a straight line. That why I didn't like it. Hard to flat trim when line does that.